The recent trend in Twin Roll Casting has been to reduce the casting gauge to less than 3mm in order to reduce the processing costs, to take advantage of increasing rates of solidification and to increase productivity. To fully utilize the potential of its thin gauge and wide strip easter investment, ASSAN Aluminum, in cooperation with FATA Hunter and the Marmara Research Center, has recently initiated an extensive R&D program to optimize the casting parameters and to improve the metallurgical quality of the cast strip. 81 different samples covering a wide range of casting parameters for three common foil alloys, AA8011, AA8006 and AA1200, were cast on an industrial scale with a 1725mm-wide SpeedCasterR. The effect of casting parameters on the macrostructural features of twin roll cast strips was investigated in the first phase of this program and was recently reported. This paper describes the microstructure of the thin-gauge wide-cast AA8011 strips and their response to thermo-mechanical processing with a particular emphasis on the evolution of the grain structure in the course of down-stream processing.